crates/api/src/post/like.rs

   1 use crate::Perform;
   2 use actix_web::web::Data;
   3 use lemmy_api_common::{
   4   build_response::build_post_response,
   5   context::LemmyContext,
   6   post::{CreatePostLike, PostResponse},
   7   utils::{
   8     check_community_ban,
   9     check_community_deleted_or_removed,
  10     check_downvotes_enabled,
  11     local_user_view_from_jwt,
  12     mark_post_as_read,
  13   },
  14 };
  15 use lemmy_db_schema::{
  16   source::{
  17     local_site::LocalSite,
  18     post::{Post, PostLike, PostLikeForm},
  19   },
  20   traits::{Crud, Likeable},
  21 };
  22 use lemmy_utils::error::{LemmyError, LemmyErrorExt, LemmyErrorType};
  23
  24 #[async_trait::async_trait(?Send)]
  25 impl Perform for CreatePostLike {
  26   type Response = PostResponse;
  27
  28   #[tracing::instrument(skip(context))]
  29   async fn perform(&self, context: &Data<LemmyContext>) -> Result<PostResponse, LemmyError> {
  30     let data: &CreatePostLike = self;
  31     let local_user_view = local_user_view_from_jwt(&data.auth, context).await?;
  32     let local_site = LocalSite::read(context.pool()).await?;
  33
  34     // Don't do a downvote if site has downvotes disabled
  35     check_downvotes_enabled(data.score, &local_site)?;
  36
  37     // Check for a community ban
  38     let post_id = data.post_id;
  39     let post = Post::read(context.pool(), post_id).await?;
  40
  41     check_community_ban(local_user_view.person.id, post.community_id, context.pool()).await?;
  42     check_community_deleted_or_removed(post.community_id, context.pool()).await?;
  43
  44     let like_form = PostLikeForm {
  45       post_id: data.post_id,
  46       person_id: local_user_view.person.id,
  47       score: data.score,
  48     };
  49
  50     // Remove any likes first
  51     let person_id = local_user_view.person.id;
  52
  53     PostLike::remove(context.pool(), person_id, post_id).await?;
  54
  55     // Only add the like if the score isnt 0
  56     let do_add = like_form.score != 0 && (like_form.score == 1 || like_form.score == -1);
  57     if do_add {
  58       PostLike::like(context.pool(), &like_form)
  59         .await
  60         .with_lemmy_type(LemmyErrorType::CouldntLikePost)?;
  61     }
  62
  63     // Mark the post as read
  64     mark_post_as_read(person_id, post_id, context.pool()).await?;
  65
  66     build_post_response(
  67       context,
  68       post.community_id,
  69       local_user_view.person.id,
  70       post_id,
  71     )
  72     .await
  73   }
  74 }